Sucker rod



n. E. L. ANn'c. w. HOLMES.

sucKER Roo. APPLICATION FlLED MAR. 22. 1921.v '1,406,017'.l PatentedFeb. 7,1922.

`MIIIIIII waage ff W" i UNITED vs'lrATssl PATIENT oFFicr..

ROBERT E. L HOLMES, or EHILAEELPHIA, PENNSYLVnNIA, ANEGHARLES w. HOLMES,or NEW Yonx, N. Y., ASSIeNonS To xEYS'ToNE nnmLEnjcoMPANY, oE BEAVERFALLS, PENNSYLVANIA, A CORPORATION or IENNsYLVANIA.

f SUCKER non.

To all'whomztmy concern:

Be itknown that wle-ROBERT E. L; HoLMEs and CHARLES W. HOLMES, citizensof the United States, residing, respectively, at Philadelphia, in thecounty `ofPhiladelphia and State of -Penns lvania, and New York in thecounty of ew York and State of New York, have invented anew and usefulSucker Rod, Vof which the followingisI a specification.V

This invention has reference to sucker I rodsand is intendedparticularly for use in deep well pumps of the reciprocating. doublepiston type.

The invention relates more particularly tothe sucker rods of double4sucker rods wherein one pump piston carried bya solid rod and theotherpiston is ,carriedV byahollow rod through which the solidrodfextends.- l 1 It is the object of the invention to construct thepiston rods as to utilize resiliency or elasticity of the metal torelieve the shock due -to the closingr of the valves when each plungerstarts on its upstroke.

. To do this, the cross section at the rjoints on both the inside andoutside rods isso increased that the desirable resiliency is obtained byplacing a comparatively heavy load on a Vgiven cross section of thecenter portion of the rods without straining the joints. 0f course, thesame'result may be obtained by reducing the cross sectional area ofthecenter and outer rod except at the joints to take advantage of theresiliency of the metal without straining or crystallizing the joints. y

'In accordance with'A the invention, the rod ends are upset lengthwise,either actually or effectively, and the meeting ends of the rods areunited by couplings with the meeting ends of the hollow rods providedveach with -an internal circumferential groove, whereby a certainelasticity or springiness is imparted to therod. The groove so producedhas a further function in providing in the hollow rod a lubricantcontainer, whereby the movement of 'one rod with respect to the otherdistributes the lubricant on the inner surface of the hollow rod and onthe outer surface ofthe solid rod, thereby avoiding the effects of wear.

The invention will be best understood from a consideration of thefollowing de- Specification of Letters Patent.

vpressed in the appended claims.`

.Patented Febiv, kv1,9212."l

Application 1ed..-l\l[a,'rchA 22, 1921. Serial 110.454,50.

tailed description l taken in connectionfvwith the accompanying drawing,`forming-part of this specification, 4with the understandf ing, however,that the inventionis notffconlined to any strict conformity with, the`sho-wing of the drawing but maybe changedv and modified so long as suchchanges gand modiications mark-no material departurefrom the salientfeatures ofthe invention asex- In the drawing:

Fig: 1 isa longitudinal section,zpartlyin elevation, of a pump cylinder,pistons and hollowand solid piston rods. l i 1 F ig. 2 is a"longitudinal section through ajoint of the hollow:` and 'solid rodsfonlalarger `scale than'Fig. v l Yand*reinoved'from the pump casing.v A f iReferring to the drawings, there isshown a pump casing 1 to which-isconnected a pum barrel 2, andthelatter is .Shownfas provided with abushing or connection 3, to receive a .pumpstrainen Within the pumpbarrel 2 arev lodged two pistons 4.-,55 respectively of thetype,employedv in `deep wells.- These pistons are ofthe reciprocatory-forniand are each provided: with valves which, however, are not particularlyvlshown' in the drawings-for thef valves in .themselves','or evenv thespecific structure -of VVthe land the rods is such that the pistons arereciprocated in opposition, so that, as is customary in such pumps, thetwo pistons propel a' continuous stream of vwater from the well.

The hollow pump rod 6 is composed of numerous sections joined end toend, the number of sections depending upon the depth of the well and thesolid pump rod is likewise composed of numerous sections joined end toend. Each section of the pump rod 6 has longitudinally upset ends 8,each with a tapered outer threaded surface 9 and these threaded ends arejoined together by a coupling sleeve 10provided with inner taperedscrewethreads 11. The solid rods 7 is connected together at the meetingends of the sections by coupling sleeves 12, and ntermediate of thecoupled ends the solid rod is customarily of square shape, as shown at13.,V The interior ofeach section of the hollow rod 6 has, for thegreater portion of its length, v'a'v bore 14 of greater diameter thanthe terminal portions ofthe bore indicated e at and occupying-the upsetends 8 of the holow rod. Where that portion of the hollow rod of largerbore, as indicated at 14,

approaches the upset portion 8, that is, the portion of smaller bore,there is an interior I circumferential groove l16 deeper than the Y ingholes in the hollow rod, this being one l of the primary advantages ofusing the upset ends 'of the hollow rod. Furthermore, this produces athickening of the metal at the point where friction occurs on theoutside-rod and the added thickness thereby caused inY the walls of thehollow rodimaterially prolonging the life lof such outside or hollowrod. v

WVhat is claimed is :--V 1 Y Y.

1. A pump iodassembly for double piston deep well pumps,comprisinghollow and solid ,reciprocatory pump rods', with each rodprovided with joints between'the meeting ends of the respective sectionsand the rod sections 'adjacent to the joints being ren- Y dered elasticvor resilient longitudinally 'to neutralizethe shock due to the closingof the valves on the up strokes of the rods.

-2.fA pump rod assembly. for double reciprocatory piston pumps, providedwith joints between the meetingfends of the respective sections and therod sections adjacent `to the joints being rendei'ed elastic orresilient4 longitudinally by producing Ycircumferential channelsiintheir-Walls, therebyieducingthe thicknessof the vmetal Yat such points.

Y3. `A pump rod assembly, comprising hollow and solid concentricreciprocatory joints being upset and then'l reduced thickness incircumscribed zones toneutrall iZe the shock due to the closingof'th'evalves on the up strokes of the rods.

4c. A pump Irod assembly for double pis-V ton deep well pumps,'comprising concentric hollow and solid pump rods reciprocable in ypumvprods and pistons to correspond with v joints at the meetings ends Q fthe respectiveV sections-'and' said rod sections adjacent thealternation and the outer rod having its sections provided with enlarged5' couplings interiorlyreduce'd in circum'scribed ci'icuinferentialZones, whereby to lthere reduce the crosssectional area-and increase theelastic o rjresilient characteristic 'of therod andthus tend toneutralizethe shock to the rodV and valves due to the closing ofthelatter Y' on the up strokes of the rods.` i

5.*A pump ro'd assembly for double piston deep well pumps, comprising"coii'cen`v A trichollow and solidV pump rods with oin'ts atithemeetingends of the-respective sections, withl the ends of the hollow sections lY where connected together reduced in internal diameter and increasedineirternal diameter whereby there is added thickness and a localizationof wear due toy friction between the two rods and a corresponding Vpro-*longation of thev'life of the 'outside or hollow rod. f Y

In 'testimony that we claim j the vforegoing as our own,-we havehereto'aflixed our `sig'- natures. v

Vf-ROBERTfEQv L. HoLMEs Y CHARLES w. HOLMES, Y

